Ultrahigh-speed Si-integrated on-chip laser with tailored dynamic characteristics

Gyeong Cheol Park, Weiqi Xue, Molly Piels, Darko Zibar, Jesper Mørk, Elizaveta Semenova, Il-Sug Chung

Research output: Contribution to journalJournal articleResearchpeer-review

395 Downloads (Pure)

Abstract

For on-chip interconnects, an ideal light source should have an ultralow energy consumption per bandwidth (operating en-ergy) as well as sufficient output power for error-free detection. Nanocavity lasers have been considered the most ideal for smaller operating energy. However, they have a challenge in obtaining a sufficient output power. Here, as an alternative, we propose an ultrahigh-speed microcavity laser structure, based on a vertical cavity with a high-contrast grating (HCG) mirror for transverse magnetic (TM) polarisation. By using the TM HCG, a very small mode volume and an un-pumped compact optical feedback structure can be realised, which together tailor the frequency response function for achieving a very high speed at low injection currents. Furthermore, light can be emitted laterally into a Si waveguide. From an 1.54-μm optically-pumped laser, a 3-dB frequency of 27 GHz was obtained at a pumping level corresponding to sub-mA. Using measured 3-dB frequen-cies and calculated equivalent currents, the modulation current efficiency factor (MCEF) is estimated to be 42.1 GHz/mA(1/2), which is superior among microcavity lasers. This shows a high potential for a very high speed at low injection currents or avery small heat generation at high bitrates, which are highly desirable for both on-chip and off-chip applications.
Original languageEnglish
Article number38801
JournalScientific Reports
Volume6
ISSN2045-2322
DOIs
Publication statusPublished - 2016

Bibliographical note

Creative Commons Attribution License 4.0

Fingerprint

Dive into the research topics of 'Ultrahigh-speed Si-integrated on-chip laser with tailored dynamic characteristics'. Together they form a unique fingerprint.

Cite this